77738638068165 has 16 divisors (see below), whose sum is σ = 124774192591488. Its totient is φ = 41329816408896.

The previous prime is 77738638068163. The next prime is 77738638068187. The reversal of 77738638068165 is 56186083683777.

It is not a de Polignac number, because 77738638068165 - 2¹ = 77738638068163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77738638068163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8174405137 + ... + 8174414646.

It is an arithmetic number, because the mean of its divisors is an integer number (7798387036968).

Almost surely, 2^{77738638068165} is an apocalyptic number.

It is an amenable number.

77738638068165 is a deficient number, since it is larger than the sum of its proper divisors (47035554523323).

77738638068165 is a wasteful number, since it uses less digits than its factorization.

77738638068165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16348820108.

The product of its (nonzero) digits is 1706987520, while the sum is 75.

The spelling of 77738638068165 in words is "seventy-seven trillion, seven hundred thirty-eight billion, six hundred thirty-eight million, sixty-eight thousand, one hundred sixty-five".